CRANKSHAFT GP 2985888 - Caterpillar

TYPE="LEVEL" DEPTH="1" @@@-->Engine Shutoff Controls
Secondary shutoff controls may be electrically, mechanically or hydraulically operated. Familiarize yourself with the types and locations of the shutoff controls, the conditions which cause each control to function, and the resetting procedure required to start your engine.The operation of all electrical shutoff controls is similar. A critical operating condition actuates a switch to stop the engine. The shutoff control may require resetting before the engine can start.The shutoff controls should be tested every 1000 hours by authorized Caterpillar dealer personnel.Do not use the emergency shutoff control for a normal stopping procedure.Always determine the cause of the shutdown, and have the necessary repairs made before restarting the engine.Alarm Switches
Alarm switches are set at a less critical temperature, pressure, or level limit than the shutoff controls. The purpose of the alarm switch is to alert the operator that an unsafe operating condition is starting to occur. Corrective measures must be taken to avoid possible damage to the engine.Marine engines can be equipped with either alarm or shutoff systems. However, in many operations an uncontrolled shutdown can cause an accident far more serious than the damage to the engine, particularly on propulsion engines.Marine propulsion engines are usually equipped with various alarm systems. The most common alarm systems indicate high jacket water temperature, high inlet air temperature, high oil temperature and low oil pressure.When an alarm is activated, corrective measures must be taken before the situation becomes an emergency.Each alarm switch is electrically connected to an indicator light, bell or horn. The alarm will continue until the condition is corrected. Then the light will turn off and the bell or horn will be silenced.To silence the bell or horn while repairs are being made, a two-way switch and a red indicator light may be installed. The red indicator light will come on when the alarm is turned off.The red light will stay on, to indicate that the engine is not protected, if the switch is left in the OFF position after the repairs have been made.Testing Alarms
All alarms on the engine should be tested twice a year for proper operation by referring to the Service Manual or authorized Caterpillar dealer personnel.
During testing, abnormal operating conditions must be simulated. Perform the tests correctly to prevent possible damage to the engine.
Oil Pressure Switch
Typical ExampleThis low oil pressure switch is used in the oil system to stop the engine when oil pressure drops below rated system pressure.Coolant Temperature Switch
Typical ExampleThe shutoff switch is located in the water temperature regulator housing. Excessive water temperature closes the switch. No resetting procedure is required. The switch opens as the coolant cools.
The sensing element must be submerged in the coolant to operate. The shutoff cannot actuate if the coolant level is low and not activating the sensing element.
Air Shutoff Control
The air shutoff control is an attachment to the engine shutoff devices. When an emergency condition occurs, the solenoid pushes the rack into the shutoff position and a solenoid trips a butterfly valve, located in